# dynamically define the methods to get/set based on percent complete for both the
# actual and planned values
methods = { :planned => 'complete', :actual => 'completed' }
...

def planned_percent_complete
    if self.planned_complete_in_dollars != nil
      (( self.planned_complete_in_dollars.to_f / self.task.budget.to_f )  * 100).round(2)
...